Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/2817
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dc.contributor.authorLi, Len
dc.contributor.authorGodwin, Ian Roberten
dc.contributor.authorLiu, S Men
dc.contributor.authorOddy, Huttonen
dc.contributor.authorNolan, John Vivianen
dc.date.accessioned2009-11-02T15:48:00Z-
dc.date.issued2006-
dc.identifier.citationAustralian Journal of Experimental Agriculture, v.46, p. 937-941en
dc.identifier.issn1446-5574en
dc.identifier.issn0816-1089en
dc.identifier.issn1836-5787en
dc.identifier.issn1836-0939en
dc.identifier.urihttps://hdl.handle.net/1959.11/2817-
dc.description.abstractTwenty castrated male sheep were selected from a commercial flock, 10 with high estimated breeding values (EBVs) (F+) and 10 with low EBVs for wool production (F-). Five of each EBV treatment were offered feed at 0.8M [0.8 times their metabolisable energy (ME) requirement for maintenance] and the other 5 were offered feed at 1.8M for 6 weeks. On the midside area of skin, the F+ group had a greater rate of clean wool growth (g/100cm².day) and daily growth in fibre length (mm/day) than the F- group at both feeding levels (P<0.05). Fibre diameter (FD) was finer for F+ than F- sheep at both feeding levels (P<0.001). As the feeding level increased, FD increased (P<0.001), but the ratio of fibre length growth to mean FD remained constant. The secondary follicle density in F+ sheep decreased with an increase in the feeding level (P<0.01), whereas the secondary follicle density of F– sheep remained unchanged (P>0.05). The ratio of secondary to primary follicles (S/P) was 21% higher (P<0.01) in skin from F+ sheep than in skin from F– sheep, but this difference was not related to the feeding level. Skin thickness at the midside was thinner (P<0.05) when sheep were underfed, but F+ sheep had a thicker (P<0.05) skin than F– sheep. The trephine (diameter: 1.5 cm; area: 1.766 cm²)-sampled skin weight was heavier for F+ than for F- (0.339 v. 0.294 g, P<0.05) but did not differ (P>0.05) with the level of intake. The weight of the dermis layer was greater in F+ than F– sheep (0.231 v. 0.190 g per trephine, P<0.05) and F+ sheep also tended to be more responsive to feeding level than F– sheep (interaction: P = 0.06). True protein content per 100 g wet skin did not differ between F+ and F– sheep or between feeding levels, whereas the protein content per 100 cm² skin was significantly (P<0.05) higher in F+ sheep. The concentration of collagen in skin protein (g/100 g) was lower in F+ sheep than F– sheep at both feeding levels (P<0.05). Of the amino acids evaluated, significant differences occurred between F+ and F– sheep for the methionine (Met) concentration in plasma (P<0.05) and in the free amino acid pool in the skin (P = 0.06). The distribution ratio of skin Met concentration to plasma Met concentration was significantly lower in the F+ sheep than F– sheep (0.77 v.1.18 kg skin/ L plasma). Results presented here indicate that skin characteristics such as skin thickness, follicle density, S/P ratio, skin weight, dermis weight, true protein or collagen content were a consequence of genetics and nutritional variation in wool growth rate, fibre length and fibre diameter. Selection for high EBVs for wool growth has resulted in animals which grow more wool at the 2 levels of feed intake provided, supported by their higher S/P ratios, higher skin and protein masses, more responsive dermides and higher efficiency of Met usage in skin tissue.en
dc.languageenen
dc.publisherCSIRO Publishingen
dc.relation.ispartofAustralian Journal of Experimental Agricultureen
dc.titleSkin characteristics and Skin protein composition of Merinos differing in estimated breeding values for wool growth and fed at above and below maintenanceen
dc.typeJournal Articleen
dc.identifier.doi10.1071/EA05377en
dc.subject.keywordsAnimal Nutritionen
local.contributor.firstnameLien
local.contributor.firstnameIan Roberten
local.contributor.firstnameS. M.en
local.contributor.firstnameHuttonen
local.contributor.firstnameJohn Vivianen
local.subject.for2008070204 Animal Nutritionen
local.subject.seo2008830311 Sheep - Woolen
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.emaillli3@une.edu.auen
local.profile.emailigodwin@une.edu.auen
local.profile.emailvoddy@une.edu.auen
local.profile.emailjnolan@une.edu.auen
local.output.categoryC1en
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.identifier.epublicationsrecordpes:4225en
local.publisher.placeAustraliaen
local.format.startpage937en
local.format.endpage941en
local.identifier.scopusid33745380651en
local.peerreviewedYesen
local.identifier.volume46en
local.contributor.lastnameLien
local.contributor.lastnameGodwinen
local.contributor.lastnameLiuen
local.contributor.lastnameOddyen
local.contributor.lastnameNolanen
dc.identifier.staffune-id:lli3en
dc.identifier.staffune-id:igodwinen
dc.identifier.staffune-id:hoddy2en
dc.identifier.staffune-id:jnolanen
local.profile.orcid0000-0001-7949-950Xen
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.identifier.unepublicationidune:2894en
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
local.title.maintitleSkin characteristics and Skin protein composition of Merinos differing in estimated breeding values for wool growth and fed at above and below maintenanceen
local.output.categorydescriptionC1 Refereed Article in a Scholarly Journalen
local.relation.urlhttp://nla.gov.au/anbd.bib-an4599774en
local.search.authorLi, Lien
local.search.authorGodwin, Ian Roberten
local.search.authorLiu, S. M.en
local.search.authorOddy, Huttonen
local.search.authorNolan, John Vivianen
local.uneassociationUnknownen
local.year.published2006-
Appears in Collections:Journal Article
School of Environmental and Rural Science
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